This version of the plugin requires WordPress 3.0 or higher. It fixes several minor issues in the 2.5.0 release, including:
Fixes a problem with the Auto-Delete Spam option that prevented spam from being deleted
The status badge is now displayed only when needed, and is less obtrusive
Fixes a rare bug that could cause the retry queue to get stuck
Several minor fixes to the deletion and retry cron jobs
Akismet is a hosted web service that saves you time by automatically detecting comment and trackback spam. It’s hosted on Akismet servers, but website operators have access to it through plugins and an API.